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~ • ~{~ ~ .~ <br />ll4 Loamy Plains MI.RA 49 b 70 <br />Dangerous Animals ~~ <br />Common Name Scientific Name Season Affected ~f <br />Narrowleaf Astragalus pectinatus early in cattle <br />poison vetch spring when <br />forage is <br />scarce. <br />Effect Upon Animal <br />Poisoning is associated with selenium poisoning. When plants are <br />crushed in the hand, a sulfurous odor is given off. Poisoning can <br />cause alkali disease (the chronic disease) which develops from eating <br />small amounts of selenium bearing vegetation over an extensive period <br />of time or poisoning can cause blind staggers (the acute disease) <br />which results from feeding on relatively large amounts of selenium in <br />a short time. In acute cases of selenium poisoning, animals walk <br />aimlessly into objects. "Blind staggers" or alkali disease are names <br />given for the disease. Hoofs grow abnormally with the formation of <br />deep rings. The hair falls out--especially the mane and tail of <br />horses. Recovery of animals affected may take several months or <br />years, even after being placed on good forage. <br />7. Location of Typical Example of This Site <br />a. Charles Strasia Ranch, Trinchera <br />b. Chase Ranch, Rattlesnake Butte <br />c. Siloam West of Pueblo, Colorado <br />8. Gui de to Initial Stocking Rates 4/ <br />Condition Percent Climax <br />Class Vegetation AUM/ha ha/AUM AUM/ac ac/AUM <br />excellent 76-100 1.2-.95 .84-.9 .47-.36 2.1-2.7 <br />good 51-75 .94-.64 1.0-1.5 .37-.26 2.7-;5.8 <br />fair 26-50 .63-.32 1.6-3.1 .25-.13 4.0-7.6 <br />poor 0-25 .31- 3.2- .12- 8.3- <br />9. Field Offices in Colorado Where the Site Occurs <br />348 Pueblo <br />352 Springfield <br />356 Trinidad <br />359 Walsenburg <br />4/ Stocking rates are based on an average growing season. Batted on 1200 <br />pounds (540 kg) of forage (air-dry) per animal unit month. (This figure <br />takes into account the vegetation that disappears through trampling, ama:ll - <br />herbivores, etc., which amounts to approximately 7.9 pounds (3.,6 kg) per day <br />under normal conditions). <br />-6- <br />